// JavaScript Document
function createxmlhttp(){
	var xmlhttp = null;
	if(window.XMLHttpRequest){
		xmlhttp = new XMLHttpRequest();
	}else if(window.ActiveXObject){
		try{
			xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");
		}catch(e){
			try{
				xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
			}catch (e){
         		alert("您的浏览器不支持AJAX！");
//         return false;
         	}
		}
	}
	return xmlhttp;
}

